Engine valve-gear.



W. H.-SMITH. ENGINE VALVE GEAR.

APPLIOATIONIFLBD JULY 22, 1914.

Patented Mar. 23, 1915.

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construction and arrangement and combina- WILLIS H. SMITH, OF KNOXVILLE, TENNESSEE.

ENGINE VALVE-GEAR. v

Specification of Letters Patent.

Application filed J'uly 22, 19 14. Serial No. 852,411. v

To all whom it may concern:

Be it known that I, VVILLIs H. SMITH, citizen of the United States, residing at Knoxville, Tennessee, have invented certain new and useful Improvements in ,Engine Valve-Gear, of which the followingis a specification.

My present invention valve gear disclosed in Letters Patent of the United States grantedtomeFebruary 10, 1914, #1,086,47 6. In this type of valve gear the slide valve is operated through connections leading to an auxiliary crank mounted on a main crank which, in turn, is mounted on the drivewheel, and whichmain crank is connected through a pitman to the ordi nary piston rod,rthe control of the slide valve being effected by connections from'a hand lever to the pitman which forms a part of the connection between the auxiliary crank and the said slide valve.

The invention consists in the features of tion of'parts hereinafter described and particularly defined by the appended claims.

The accompanying drawing shows in side elevation and in the nature of a diagram the improvement in place and connected up with .the connections leading to the slide valve.

In these drawings, the drive wheel is in dicated at 5 provided with a main crank 6 which is connected through a pitman or main rod 7 with the ordinary crosshead 7" from which the ordinary piston rod 7 eX tends to the piston in the steam chest or cylinder.

8 indicates an auxiliary crank mounted on the main crank 6 and from which connections lead to the slide valve to operate the latter These connections include the pitman 9, a link 10 extending upwardly crank 8 moved in a concentric path around the axis of the drive wheel 5, a forward and back and a vertically oscillating movement- ,will be given to the pitman 9, and this movement will be imparted through the link 10, arms 11 and 13, and rod 14 to the slide valve.

relates to the type of .cated generally at 35.

This fulcrum for the pitman 9 is furnished- Patented Mar. V

by a link- 31 connected with the pitman9 pivotally. at 30, the upper end of saidlink;

31, being connected at 32 pivotally with arocker member 23 which, in, turn, is sup mounted on the transverse shafts18 and 21 journaled in suitable bearings on theframer The rocker member 23is pivotally connected with the upper ends of these arms 20 and'22,

and these arms extendsubstantially parallel with each other. The rocker arm may aS- 31 is of the same length as the arms'20 and 22. The arm 20, as before stated, is mount-' f ed on the shaft 18, and this shaft has another arm thereon which is connected through a rod 19 with the hand lever 34. This hand lever maybe set in various positions, and held by a toothed segmentindi- By adjusting this hand lever the-arm 20, together, with the 1 0, rocker arm or triangle 23, will be adjusted,"

the arm 22 also having rocking'movement for this purpose, and thus the'upperpivot 32 of the fulcrum link 31 will be altered in c position relative to the connections leading to the slide valve, and consequently the fulcrum 30 for the pitman 9 will be altered in its position, and thus the link 10 andthe connections therefrom to the slide valve will be adjusted. Bythe use of the triangular rocker the pivot 32 is arranged low down in respect to the pointsof connection between the rocker and the arms 20 and 22, and thus the link 31 can be madeof the' same length as said arms 20 and 22. This will insure proper reversal of the engine, enabling ,the slide valve to have the proper length of travel. 7 I p v On the shaft 18 at about the center thereof a counter balance is arranged which-consists of two coil springs 36 and 37 connected-with the said shaft 18, so that when the gear is shifted forward 'orbackward this counter 8 6o ported on rocker arms 20 and 22 respectively or other engine having only one cylinder, in which case only one set of connections above described will be used.

I claim as my invention 1. A steam engine valve gear comprising a pitman, an auxiliary crank connecting the same with the drive Wheel, connections from the said pitman to the slide valve, a link pivotally connected with the pitman and furnishing a fulcrum therefor, a pair of arms arranged parallel and pivotally mounted at their lower ends, a rocker member connected With the upper ends of said parallel arms, the said fulcrum link being pivotally connected to said rocker member at a point below the points of connection be tween said rocker member and the parallel arms, so that lines drawn to connect said three points Would form a triangle, said fulcrum link being of the same length as the said parallel arms, and means for rocking the parallel arms to adjust the fulcrum link, substantially as described.

2. In combination in engine valve gear, connections to the slide valve including a pitman, an auxiliary crank to Which the pita pair of parallel arms mounted on the frame pivotally, a rocker connected With the parallel arms, a fulcrum link between the rocker and the pitman, and a counter balance connected With one of the parallel arms, substantially as described.

In testimony whereof, I affix my signature in presence of tWo Witnesses.

WILLIS H. SMITH.

Witnesses LILLIAN HAWKINS, C. E. GORE.

flopies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatenta Washington, D. C. 

